Sluice down is a term used to describe the act of cleaning or washing something using a large amount of water. There are several synonyms that can be used instead of the term sluice down. The word hose down can be used when referring to washing or cleaning something with a hose. The term drench can also be used instead of sluice down, as it refers to completely soaking something with water. Another synonym for sluice down is wash down, which can be used to describe the act of washing using a hose or a bucket of water. Finally, splash can also be used instead of sluice down as it describes the act of throwing water on something.